﻿/*    
    OpenMheg - A free MHEG-5 library
    Copyright (C) 2008 Dharmesh Malam

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
using System;
using System.Collections.Generic;
using System.Text;
using Core.Model;
using ASN1Decoder.Builders.Nodes;
using Exceptions;
using Core.Model.Groups;
using Core.Model.Ingredients;
using Core.Model.Ingredients.Presentable;

namespace ASN1Decoder.Builders.Visibles
{
    internal class StreamBuilder
    {
        internal static Stream Build(TaggedNode node, Group group)
        {
            var stream = new Stream();
            IngredientBuilder.Build(node, stream, group);

            TaggedNode e;

            if ( (e = node[ASN1ContextCodes.C_MULTIPLEX]) != null)
                stream.Multiplex = BuildMultiplex(e, group);
            else
                throw new OpenMhegException("Missing Multiplex");

            if ( ( e = node[ASN1ContextCodes.C_STORAGE]) != null)
                stream.Storage = e.First.BoolValue;

            if ( ( e = node[ASN1ContextCodes.C_LOOPING]) != null)
                stream.Looping = e.First.IntValue;


            return stream;
            
        }

        private static List<Ingredient> BuildMultiplex(TaggedNode node, Group group)
        {
            var multiplex = new List<Ingredient>();
            
            if (node.Size < 1) throw new OpenMhegException("No items in multiplex");

            foreach ( TaggedNode e in node)
            {
                switch (e.Tag)
                {
                    case ASN1ContextCodes.C_AUDIO:
                        multiplex.Add(AudioBuilder.Build(e, group));
                        break;
                    case ASN1ContextCodes.C_VIDEO:
                        multiplex.Add(VideoBuilder.Build(e, group)); 
                        break;
                    case ASN1ContextCodes.C_RTGRAPHICS:
                        throw new OpenMhegException("FIX ME: RTGRAPHIC not supported");
                        break;
                    default:
                        throw new OpenMhegException("Unknown Stream Item");
                }
            }

            return multiplex;
        }

    }
}
